共查询到14条相似文献,搜索用时 46 毫秒
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利用单辊快淬法制备了Fe74Y6-xNbxB20(x=0,1,2,3,4)非晶合金条带,利用XRD、HRTEM、DTA和VSM对样品的结构、非晶形成能力和磁性能等进行了测试。结果表明:Fe74Y6–xNbxB20(x=1,2,3,4)合金系的饱和磁化强度Ms>104 A.m2/kg,矫顽力Hc<1.59 kA/m,显示出良好的软磁性能。添加微量Nb扩大了非晶合金的过冷液相区,当Nb含量为摩尔分数1%时,过冷液相区Tx=63℃,此时合金具有最大的非晶形成能力,同时具有最大的饱和磁化强度(Ms=133 A.m2/kg)和最低的矫顽力(Hc=1.27 kA/m)。 相似文献
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采用单辊快淬法制备了Fe81Zr7Nb2B10和Fe78Co2.5Zr7Nb2B10Cu0.5非晶合金,在不同温度下对两种合金进行了热处理。利用差热分析仪(DTA)、X射线衍射仪(XRD)和振动样品磁强计(VSM)等仪器对两种合金的热性能、微观结构和磁性能进行了测试分析。结果表明在Fe78Co2.5Zr7Nb2B10Cu0.5合金的晶化过程中存在预结晶效应,而在Fe81Zr7Nb2B10合金的晶化过程中没有。Fe81Zr7Nb2B10和Fe78Co2.5Zr7Nb2B10Cu0.5合金经803 K退火后,分别有α-Fe和α-Fe(Co)相从非晶基体中析出。随退火温度的升高,两种合金的比饱和磁化强度(Ms)变化趋势相似,但矫顽力(Hc)变化趋势明显不同。 相似文献
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以FeCl3为原料,尿素为添加剂,NaOH为pH值调节剂,采用sol-gel法制备出前驱体Fe(OH)3胶液。将其烘干、高温灼烧制备了磁性粒子Fe2O3。研究了pH值和灼烧温度对Fe2O3相成分和磁性能的影响。结果表明:当pH值为3,4,灼烧温度为450℃时,产物为高纯度γ-Fe2O3,饱和磁化强度Ms为12.8A·m2·kg-1;当pH值为7,灼烧温度为500℃时,产物是单相的α-Fe2O3,结晶完好,产物的饱和磁化强度Ms为3.1A·m2·kg-1。 相似文献
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采用单辊快淬法制备了Fe40Co40Zr7Nb2AlB9Cu非晶合金薄带,在不同温度下对其进行等温退火处理。研究了退火温度对合金的结构、热行为和磁性能的影响。结果表明:Fe40Co40Zr7Nb2AlB9Cu非晶合金的DTA曲线存在2个晶化放热峰,晶化激活能分别为267.3 kJ/mol和188.3 kJ/mol。其晶化过程为:非晶→非晶+α-FeCo→α-FeCo+Co2Zr+ZrCo3B2+Fe(Co)3Zr。α-FeCo相的晶化体积分数和晶粒尺寸随退火温度的升高而逐渐增大。低于873 K退火时,矫顽力变化不明显;873 K退火时,矫顽力达到最小值0.27 kA/m;高于873 K退火时,矫顽力逐渐增大。 相似文献
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采用单辊快淬法制备了Fe93–x Zr7Bx(x=10,12,14)合金,并对三种合金进行了不同温度退火处理,利用X射线衍射仪(XRD)、差热分析仪(DTA)和振动样品磁强计(VSM)研究了该系列合金的微观结构、热性能和磁性能。研究结果表明:B含量的增加提高了合金的第一晶化峰峰值温度。在Fe83Zr7B10合金晶化初期仅观察到α-Fe相,而在Fe93–x Zr7Bx(x=12,14)合金晶化初期可观察到α-Fe相和Fe23B6相。三种合金淬态时的Ms随B含量的增加而增大。在高于823 K的温度下退火后,三种合金的Ms随B含量的增加而减小。高于773 K退火后,三种合金的Hc随B含量的增加而增大。 相似文献
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N. Krasteva S. Armyanov J. Georgieva N. Avramova V. Fotty 《Journal of Electronic Materials》1995,24(8):941-946
The thermal stability and the preservation of paramagnetic state of amorphous electroless NiP alloys are important for many
industrial applications. The addition of third component (Me = Cu, Sn, or Sb) to NiP alloy should reduce the magnetic moment
of precipitated ferromagnetic phase. The influence of Me on the thermal stability of ternary alloys is studied. Using differential
scanning calorimetry, analysis of the crystallization kinetics is carried out. The remanence after annealing at different
temperatures is presented. 相似文献
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A study of thermal and magnetic properties and of the giant magneto-impedance (GMI) effect in cobalt-based amorphous alloy ribbons Co80-xFexB10Si10, with x=6, 8 and 10 is presented. The thermal and magnetic characterization was carried out using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), magnetization and magneto-impedance measurements. The ribbons exhibit ultrasoft magnetic behavior, especially GMI effect. Particular attention has been given to observation of crystallization kinetics. 相似文献
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《Microelectronics Reliability》2014,54(6-7):1115-1118
The effect of charge trapping on the performance of sectorial Split-Drain Magnetic Field Effect Transistor (SD-MAGFET) under the influence of magnetic field is examined based on conventional capacitance measurement techniques upon different magnetic field strength and thermal conditions. The experimental results confirmed the charge trapping effect in sectorial SD-MAGFET is magnetic field and temperature dependent, where the charge trapping sites are localized at the channel boundary, which verifies the conjecture of trap-assisted magnetic sensitivity hysteresis and deterioration of the device found in recent literatures. The results of the study are useful to sectorial SD-MAGFET in high performance magnetic sensing applications. 相似文献
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Miyuki Hayashi Masahiro Susa Toshio Maruyama Kazuhiro Nagata 《Journal of Electronic Materials》1995,24(8):983-989
The annealing of 20CaO·20SiO2·7Fe2O3·6FeO glasses at 973K in vacuo produced clusters of iron oxide, the shape of which was nearly spherical and the diameter distributed in the narrow range 25–115Å. The phase of clusters was identified to be Fe3+(Fe3+ poststagger|1.30Fe2+ poststagger|0.55V0.15)·O4 in the inverse spinel structure based upon the Mössbauer spectra and x-ray diffraction profiles. The clusters exhibited superparamagnetism and their effective anisotropy energy constant was inversely proportional to the cluster diameter. The magnetization of the glasses measured by a vibrating sample magnetometer was 7.2 × 10-6 Wbmkg-1 at 10 kOe at room temperature and smaller than the value calculated assuming that the whole clusters have superparamagnetism. These results suggest the pinning of spins near the cluster surface. 相似文献
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The thermal stability of a 100-nm thick sputter-deposited Re film as contact to 6H-SiC was studied by backscattering spectrometry and by measurements of the forward current-voltage (I-V) characteristic. The initial Schottky barrier height of 0.71 eV and ideality factor of 1.6 change after 2 h of annealing in vacuum at 700/spl deg/C to 1.04 eV and 1.1, respectively. They remain stable after annealing for additional 2 h at that same temperature. The initial change is attributed to a recovery of sputter damage in the SiC. The observed stability of the Schottky barrier is attributed to the thermodynamic stability of Re with SiC, as confirmed by the unchanging backscattering depth profiles. After annealing at 900/spl deg/C, the Schottky barrier becomes unstable although no interaction between the Re film and the SiC substrate is detectable in the depth profiles. 相似文献